Weird Doctors in Wuxia

Doctors in wuxia are unlike modern doctors, whose main goal is to save lives. It's not easy to get help from doctors in wuxia. They either want you to give something up or won't even mind you at all. Some doctors in wuxia, who instead of curing people, actually want to take their lives. One that comes to mind is Ping Yizhi. He says if he saves one life, another life must die.

Can you name some weird doctors in wuxia that follows some strict, wacko rule? Or some that are really difficult to get help from?